A purple wave of faulty streetlights has swept across the USA, generating incorrect theories, bad lighting and fans of an accidental aesthetic.

White lighting LEDs are almost universally a combination of a blue light-emitting InGaN die and a phosphor that steals some of the blue light and converts it into a broad spectrum peaking at yellow or ...

In this method, the blue LED is used in conjunction with a yellow phosphor coating. The idea is to have part of the blue light converted into yellow light and leave a part of it in its original ...

The advantage to using a blue LED and a yellow phosphor is its high theoretical efficacy, which is attractive for the creation of a cheap, bright white-light source. However, this benefit comes at ...

or use a blue LED and cover it with yellow phosphor that filters blue wavelengths and ultimately produces a bright white light. The thickness of that layer determines the warmth of the light ...